Détail de l'auteur
Auteur Noureddine Mebarki |
Documents disponibles écrits par cet auteur (11)
Affiner la recherche Interroger des sources externesEffets de cohérence en diffusion multiple de la lumière et intrication des états cohérents / Mohamed Taha Rouabah
Titre : Effets de cohérence en diffusion multiple de la lumière et intrication des états cohérents Type de document : texte imprimé Auteurs : Mohamed Taha Rouabah, Auteur ; Noureddine Mebarki, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2015 Importance : 187 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : Physique théorique Optique quantique Effets cooperatifs Atomes froids Intrication quantique Etats cohérents Diffusion de la lumière Quantum optics Cooperative effects Cold atoms Quantum entanglement Coherent states Light scattering الضوئيات الكمية تبعثر الصوء الظواهر الجماعية الذرات الباردة التشابك الكمي الحالات المتسقة Index. décimale : 530 Physique Résumé : This work is devoted on the one hand to the investigation of coherence effects in multiple scattering of light by an atomic cloud and on the other hand to the entanglement of a deformed coherent states.
The interaction b etween light and a dilute disordered atomic cloud gives rise to collective coherent effects due to the interaction of the induced dip oles via the external field. The behavior of such coherent effects in multiple scattering regime is an important question for various physical systems. We present two theoretical models describing those coherence effects in different scattering regimes. The
scattering order expansion treatment of light scattering allows us to highlight the role of the first and second scattering orders as well as the interference between the resulting scattered fields. In the multiple scattering regime we show that the radiation pressure force is not a good observable to probe cooperative effects. Furthermore, we discover a surprising phase coherence that hints that collective effects may survive in multiple scattering regime. That could be due to a synchronization between the induced atomic dipoles.
In a second part, we study the effect of an algebra deformation on entangled coherent states. Such an approach allows to describe decoherence in perturbed entangled quantum systems. We construct a deformed coherent states and calculate their concurrence. We show that algebra deformation could have a non negligible impact on bipartite entangled coherent states if those later are not maximally entangled.
Diplôme : Doctorat En ligne : ../theses/physique/ROU6708.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9915 Effets de cohérence en diffusion multiple de la lumière et intrication des états cohérents [texte imprimé] / Mohamed Taha Rouabah, Auteur ; Noureddine Mebarki, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2015 . - 187 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : Physique théorique Optique quantique Effets cooperatifs Atomes froids Intrication quantique Etats cohérents Diffusion de la lumière Quantum optics Cooperative effects Cold atoms Quantum entanglement Coherent states Light scattering الضوئيات الكمية تبعثر الصوء الظواهر الجماعية الذرات الباردة التشابك الكمي الحالات المتسقة Index. décimale : 530 Physique Résumé : This work is devoted on the one hand to the investigation of coherence effects in multiple scattering of light by an atomic cloud and on the other hand to the entanglement of a deformed coherent states.
The interaction b etween light and a dilute disordered atomic cloud gives rise to collective coherent effects due to the interaction of the induced dip oles via the external field. The behavior of such coherent effects in multiple scattering regime is an important question for various physical systems. We present two theoretical models describing those coherence effects in different scattering regimes. The
scattering order expansion treatment of light scattering allows us to highlight the role of the first and second scattering orders as well as the interference between the resulting scattered fields. In the multiple scattering regime we show that the radiation pressure force is not a good observable to probe cooperative effects. Furthermore, we discover a surprising phase coherence that hints that collective effects may survive in multiple scattering regime. That could be due to a synchronization between the induced atomic dipoles.
In a second part, we study the effect of an algebra deformation on entangled coherent states. Such an approach allows to describe decoherence in perturbed entangled quantum systems. We construct a deformed coherent states and calculate their concurrence. We show that algebra deformation could have a non negligible impact on bipartite entangled coherent states if those later are not maximally entangled.
Diplôme : Doctorat En ligne : ../theses/physique/ROU6708.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9915 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité ROU/6708 ROU/6708 Thèse Bibliothèque principale Thèses Disponible
Titre : Etude phénoménologique du secteur des interactions électrofaibles dans les théories au-delà du Modèle Standard Type de document : texte imprimé Auteurs : Ilhem Chadou, Auteur ; Noureddine Mebarki, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 95 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles. Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : NCMS Higgs photon direct section efficace interaction électrofaible direct photon cross section electroweak interaction الهيغز الفوتون المباشر المقطع العرضي التآثر الكهروضعيف NCMS Index. décimale : 530 Physique Résumé : In this thesis, we have studied the phenomenological study of theories beyond the standard model, and in particular the non-commutative standard model, in the electroweak interaction sector.
For thus studied, we have many processes of particle physics:
Production and disintegration of the Higgs boson, production of direct photons following the proton-antiproton annihilation, electronpositron annihilation in two photons. This essentially allowed us to analyze the behavior of the non-commutative cross section and to deduce new bonds on the non-commutativity parameter.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/CHA7195.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10768 Etude phénoménologique du secteur des interactions électrofaibles dans les théories au-delà du Modèle Standard [texte imprimé] / Ilhem Chadou, Auteur ; Noureddine Mebarki, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 95 f. ; 30 cm.
2 copies imprimées disponibles.
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : NCMS Higgs photon direct section efficace interaction électrofaible direct photon cross section electroweak interaction الهيغز الفوتون المباشر المقطع العرضي التآثر الكهروضعيف NCMS Index. décimale : 530 Physique Résumé : In this thesis, we have studied the phenomenological study of theories beyond the standard model, and in particular the non-commutative standard model, in the electroweak interaction sector.
For thus studied, we have many processes of particle physics:
Production and disintegration of the Higgs boson, production of direct photons following the proton-antiproton annihilation, electronpositron annihilation in two photons. This essentially allowed us to analyze the behavior of the non-commutative cross section and to deduce new bonds on the non-commutativity parameter.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/CHA7195.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10768 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité CHA/7195 CHA/7195 Thèse Bibliothèque principale Thèses Disponible
Titre : Etude phénoménologique du secteur des interactions fortes dans les théories au-delà du Modèle Standard Type de document : texte imprimé Auteurs : Mohamed Réda Bekli, Auteur ; Noureddine Mebarki, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2015 Importance : 131 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : physique théorique NCSM photon direct DGLAP Approche du gluon mou et/ou colinéaire direct photon soft and/or collinear gluon approach نموذج الغليونات اللينة و/أو الخطية الفوتون المباشر Index. décimale : 530 Physique Résumé : In this thesis, we performed calculations of higher order of some hadronic sub-processes with the soft and/or collinear gluon approach. We noticed that this new method allows us to have better results compared to the LHC and the Tevatron experimental data, in the case of direct photons production.
Subsequently, we investigated sub-processes and the physical process of direct photon production, but within the Minimal Non-Commutative Standard Model (Minimal-NCSM).
We calculated the inclusive cross section and compared the predictions of Minimal-NCSM with Tevatron's experimental data. Then, we found that non-commutative effects occur in particular for photons with large transverse momentum.
At the end of the thesis, we examined the non-commutative contribution in structure functions and scale invariance violation, which occur at the leading order of perturbation theory in the context of NCSM. The resolution of the NC-DGLAP evolution equation in momentum space, allowed us to follow the evolution of the structure functions for large x, and for different values of the non-commutative parameter Λ.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/BEK6724.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9899 Etude phénoménologique du secteur des interactions fortes dans les théories au-delà du Modèle Standard [texte imprimé] / Mohamed Réda Bekli, Auteur ; Noureddine Mebarki, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2015 . - 131 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : physique théorique NCSM photon direct DGLAP Approche du gluon mou et/ou colinéaire direct photon soft and/or collinear gluon approach نموذج الغليونات اللينة و/أو الخطية الفوتون المباشر Index. décimale : 530 Physique Résumé : In this thesis, we performed calculations of higher order of some hadronic sub-processes with the soft and/or collinear gluon approach. We noticed that this new method allows us to have better results compared to the LHC and the Tevatron experimental data, in the case of direct photons production.
Subsequently, we investigated sub-processes and the physical process of direct photon production, but within the Minimal Non-Commutative Standard Model (Minimal-NCSM).
We calculated the inclusive cross section and compared the predictions of Minimal-NCSM with Tevatron's experimental data. Then, we found that non-commutative effects occur in particular for photons with large transverse momentum.
At the end of the thesis, we examined the non-commutative contribution in structure functions and scale invariance violation, which occur at the leading order of perturbation theory in the context of NCSM. The resolution of the NC-DGLAP evolution equation in momentum space, allowed us to follow the evolution of the structure functions for large x, and for different values of the non-commutative parameter Λ.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/BEK6724.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9899 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEK/6724 BEK/6724 Thèse Bibliothèque principale Thèses Disponible
Titre : Etude théorique et applications en calcul quantique entanglement et decoherence Type de document : texte imprimé Auteurs : Mohamed Farouk Ghiti, Auteur ; Noureddine Mebarki, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2015 Importance : 95 f. Format : 30 cm. Note générale : 2copie imprimes disponibles Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : physique théorique Information quantique Intrication quantique Théorie Paraquantique Concurrence Géométrie Non Commutative Entropie de Von Neumann Quantum Information Quantum Entanglement Paraquantum Theory Noncommutative Geometry Von Neumann entropy المعلوماتية الكوانتية التشابك الكوانتي نظرية التكميم المعمم المنافسة الهندسة الاتبديلية الانتروبي. Index. décimale : 530 Physique Résumé : In this thesis we have studied a quantum phenomenon called quantum entanglement in different contexts. The mathematical formalism of paraquantum theory has been used to derive the even and odd paraquantum coherent states. We have used the concurrence to measure the bipartite entanglement of paraquantum coherent state. The behavior of the concurrence in function of the paraquantization parameter c and the coherence parameter � has been studied and analyzed. It is shown that the paraquantisation has an inverse relation with the bipartite quantum entanglement. In the second context we have studied the quantum entanglement in noncommutative Bianchi I space-time. In the first step, we have studied the pair creation mechanism. First of all, we have derived the noncommutative Dirac equation and differentiate between positive and negative modes. Then, we have calculated the fermions-antifermions pair creation density using the Bogoliubov coefficients. To measure the modes entanglement we have
used the Von Neumann entropy S!.! .
The behavior of S!.! in function of noncommutativity θ parameter and k!-modes frequencies has been presented. It is shown that the noncommutativity plays an important role and it has a direct effect on quantum entanglement, such that in a region it plays the role of gravity and in another region it behaves like a repulsive force. The results and discussions of variations of S!.! with respect to the behaviors of noncommutativity have been presented.Diplôme : Doctorat En ligne : ../theses/physique/GHI6828.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10120 Etude théorique et applications en calcul quantique entanglement et decoherence [texte imprimé] / Mohamed Farouk Ghiti, Auteur ; Noureddine Mebarki, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2015 . - 95 f. ; 30 cm.
2copie imprimes disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : physique théorique Information quantique Intrication quantique Théorie Paraquantique Concurrence Géométrie Non Commutative Entropie de Von Neumann Quantum Information Quantum Entanglement Paraquantum Theory Noncommutative Geometry Von Neumann entropy المعلوماتية الكوانتية التشابك الكوانتي نظرية التكميم المعمم المنافسة الهندسة الاتبديلية الانتروبي. Index. décimale : 530 Physique Résumé : In this thesis we have studied a quantum phenomenon called quantum entanglement in different contexts. The mathematical formalism of paraquantum theory has been used to derive the even and odd paraquantum coherent states. We have used the concurrence to measure the bipartite entanglement of paraquantum coherent state. The behavior of the concurrence in function of the paraquantization parameter c and the coherence parameter � has been studied and analyzed. It is shown that the paraquantisation has an inverse relation with the bipartite quantum entanglement. In the second context we have studied the quantum entanglement in noncommutative Bianchi I space-time. In the first step, we have studied the pair creation mechanism. First of all, we have derived the noncommutative Dirac equation and differentiate between positive and negative modes. Then, we have calculated the fermions-antifermions pair creation density using the Bogoliubov coefficients. To measure the modes entanglement we have
used the Von Neumann entropy S!.! .
The behavior of S!.! in function of noncommutativity θ parameter and k!-modes frequencies has been presented. It is shown that the noncommutativity plays an important role and it has a direct effect on quantum entanglement, such that in a region it plays the role of gravity and in another region it behaves like a repulsive force. The results and discussions of variations of S!.! with respect to the behaviors of noncommutativity have been presented.Diplôme : Doctorat En ligne : ../theses/physique/GHI6828.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10120 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité GHI/6828 GHI/6828 Thèse Bibliothèque principale Thèses Disponible
Titre : Loop quantum gravity and its geometrical applications. Type de document : texte imprimé Auteurs : Omar Nemoul, Auteur ; Noureddine Mebarki, Directeur de thèse Mention d'édition : 19/12/2019 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2019 Importance : 188 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : physique: Physique Theorique Gravitation quantique à boucles Tétraèdres quantiques Opérateur de courbure Opérateur de longueur Loop Quantum Gravity Quantum tetrahedra Curvature operator Edge length operator الجاذبية الكوانتية الحلقية رباعي السطوح الكمومي مؤثر الانحناء مؤثر الطول Index. décimale : 530 Physique Résumé :
Loop Quantum Gravity is a non-perturbative, background-independent and quantum field theory of geometry itself. It is based on the quantum implementation of General relativity (GR) by using Dirac quantization program. The kinematical Hilbert space is constructed by cylindrical wave functionals through holonomies defined by the su(2) connection along a system of smooth oriented paths. The gauge invariant Hilbert space is the kernel space of the Gauss constraints; it is constructed by the spin network state which is a collection of oriented curves, a spin number at each curve and an invariant intertwiner at each node. The area and volume operators in LQG has been provided. From their quantum spectrum, the fuzziness and discreteness property of space is predicted; it is shown that spacetime is fundamentally discrete and at the scale of the Planck length. A beautiful interpretation of the space atom in terms of the quantum Euclidean polyhedral is provided. In this thesis, an alternative approach introducing a 3d- Ricci scalar curvature operator given in terms of volume and boundary area as well as new edge length operator is proposed. An example of monochromatic 4-valent node intertwiner state (equilateral tetrahedra) is studied and the scalar curvature measure for a regular tetrahedron shape is constructed. We show that all regular tetrahedron states are in the negative scalar curvature regime and for the semi-classical limit the spectrum is very close to the
Euclidean regime.
Note de contenu : Annexes. Diplôme : Doctorat en sciences En ligne : ../theses/physique/NEM7597.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11433 Loop quantum gravity and its geometrical applications. [texte imprimé] / Omar Nemoul, Auteur ; Noureddine Mebarki, Directeur de thèse . - 19/12/2019 . - جامعة الإخوة منتوري قسنطينة, 2019 . - 188 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : physique: Physique Theorique Gravitation quantique à boucles Tétraèdres quantiques Opérateur de courbure Opérateur de longueur Loop Quantum Gravity Quantum tetrahedra Curvature operator Edge length operator الجاذبية الكوانتية الحلقية رباعي السطوح الكمومي مؤثر الانحناء مؤثر الطول Index. décimale : 530 Physique Résumé :
Loop Quantum Gravity is a non-perturbative, background-independent and quantum field theory of geometry itself. It is based on the quantum implementation of General relativity (GR) by using Dirac quantization program. The kinematical Hilbert space is constructed by cylindrical wave functionals through holonomies defined by the su(2) connection along a system of smooth oriented paths. The gauge invariant Hilbert space is the kernel space of the Gauss constraints; it is constructed by the spin network state which is a collection of oriented curves, a spin number at each curve and an invariant intertwiner at each node. The area and volume operators in LQG has been provided. From their quantum spectrum, the fuzziness and discreteness property of space is predicted; it is shown that spacetime is fundamentally discrete and at the scale of the Planck length. A beautiful interpretation of the space atom in terms of the quantum Euclidean polyhedral is provided. In this thesis, an alternative approach introducing a 3d- Ricci scalar curvature operator given in terms of volume and boundary area as well as new edge length operator is proposed. An example of monochromatic 4-valent node intertwiner state (equilateral tetrahedra) is studied and the scalar curvature measure for a regular tetrahedron shape is constructed. We show that all regular tetrahedron states are in the negative scalar curvature regime and for the semi-classical limit the spectrum is very close to the
Euclidean regime.
Note de contenu : Annexes. Diplôme : Doctorat en sciences En ligne : ../theses/physique/NEM7597.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11433 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité NEM/7597 NEM/7597 Thèse Bibliothèque principale Thèses Disponible PermalinkPermalinkPermalinkPermalinkPermalinkPermalink
